Stuck configuring 5i25 to run G540

Checking the loaded output voltage would probably tell
P2 uses a different bus chip but it may use the same 4V (not sure)

If the G540 only outputs 3.3V signals you could set the I/O tolerance for
3.3V and then the bus interface chips are powered by 5V
(unfortunately the G540 manual has no output signal specs)

Looks like there's a PI5C PCI bus chip for each port, fingers crossed.

EDIT: you beat me to it.

PCW wrote: If the G540 only outputs 3.3V signals you could set the I/O tolerance for
3.3V and then the bus interface chips are powered by 5V
(unfortunately the G540 manual has no output signal specs)

Are you able to elaborate on this? What do you mean by "set the I/O tolerance", is this HW, SW, what device is it on etc.

I guess I don't fully follow what action you're proposing.

Scratch that, I found the W3 jumper on the 5i25 that does what you suggested, I'll try that.

EDIT: I just checked the G540 Rev8 manual, looks like the spec sheet says input is 3.3-5v.

Fingers crossed!

Holy crap it works.

Note: The G540 manual does not say what the output levels are
I would check that the G540 is not outputting 5V levels